Ahmad is currently awaiting questioning by the FBI and facing five attempted murder charges in New Jersey.

He had yet to be read his rights and had not been released from the hospital in New Jersey where he was taken after the shootout with police in Linden, New Jersey, on Monday in which he was captured.

The brothers are from a large family, with the father Mohammad Rahami said by a neighbor to have has many as 11 children.

One of them, daughter Zobyedh, who is a public health student at nearby Rutgers University, posted a plea for privacy on social media on Monday, after her brother’s arrest.

One of their sisters, Aziza, who called herself Masood Maymunah on Facebook, also posted a pro-jihad message endorsing an ‘Islamic caliphate’ and saying ‘no to democracy’. She was addressed online by Mohammad Khan Rahami as ‘sis’.

It is an adaptation of a symbol commonly used during anti-government protests by the Muslim Brotherhood in Egypt in 2013, known as R4BIA, but with the addition of the messages which suggest support for al-Qaeda or ISIS.

ISIS claims to be a caliphate and had just begun its rise in 2013, but it is not clear that the adapted version of the R4BIA logo is pro-ISIS. It may also be pro al Qaeda.

Maymunah appears to have lived in Quetta, Pakistan with her husband and young children, although again it is unclear if she remains there.